The mixing process of a static mixer is carried out by a series of mixing units with different specifications installed in a hollow pipe. The mixing units function to rotate the fluid towed the left sometimes and to the right sometimes, changing the flow direction, so that, the center fluid is not only pushed to the surrounding, but the surrounding fluid is pushed to the center, resulting in a good radial mixing effect. At the same time, the fluid relying on its own rotating effect will also rotate on the interface of the connected part of adjacent components; this perfect radial circular flow mixing effect makes materials uniformly mixed.

The static mixer can be used for mixing, emulsification, neutralization, absorption, extraction, reaction, and strengthening heat transfer and other processes of liquid - liquid, liquid - gas, liquid - solid, gas - gas, and can also be used for intermittent operation and continuous operation within a range of very high viscosity in the state of different flow types (laminar flow, transition flow, and turbulent flow). A brief introduction to the scope of different applications is made at first in the following.
(1) Liquid - liquid mixing
The fluids with a viscosity in the range of 10 Mpa•s from the flow layer to turbulent flow can be mixed well. The smallest diameter of dispersed droplets can reach 1 ~ 2μm, and they distribute uniformly in size.
(2) Liquid - gas mixing
The static mixer can make the phase interface between liquid - gas two-phase components keep continuously updated and full contact, and the bubbling tower and sieve-plate column can be replaced under certain conditions.
(3) Liquid - solid mixing
When a small quantity of solid particles or powder mixes with a liquid (the area of the solids accounts for about 5% of the area of ​​liquid) in the turbulence condition, and using the static mixer can force the solid particles or powder to be fully dispersed, so as to extract or bleach the liquid.
(4) Gas - gas mixing
It can be used to mix cool and hot gases and to mix different gas components.
(5) Strengthening heat transfer
As the static mixer increases the contact area of ​​the fluid, which improves the heat transfer coefficient. In general, the cooling or heating of gases is completed by use of the static mixer, the heat transfer coefficient of gases can be increased by 8 times; the heat transfer coefficient of gases for heating viscous liquids can be increased by 5 times; the heat transfer coefficient can be increased by 8.5 times when condensing the gas in which a large quantity of non-condensable gases exist; the heat transfer of polymer melt can reduce the temperature and viscosity gradient on the pipe cross-section.